Oh ye Righteous Northerners, Defenders of the free, anti-slavery hipocrites

When people think of slavery in America they quickly think of the Civil War and the southern states. 
But....

Did you know that slavery in the north was pretty strong also? 

The first slaves were captured Native Americans, and it moved on to the blacks from there. In Colonial days is was quite common to own slaves here. In Kingston, Rhode Island, there is a church off ferry road, across the street from the church is a cemetery. The cemetery is like most others in that the graves are marked with headstones with names and dates. Behind the church, a short distance back in the woods is another cemetery, just small stones, no names or dates. According to a local historian this was the cemetery for Native Americans and slaves, and not all the graves have a marker.

The morals of Slavery in the north was debated amoungst northerners for years, but it wasn't by any grand idealism that slavery ended in the north. The fact of the matter is, slavery in the north actually ended because of economics. Without grand farms requiring a lot of hands, and with the north becoming more industrialized, with water wheels and mills, feeding and housing slaves became a drag on the economy. Slavery in the north ended in the early 19th century, only about 50 years before Lincoln read the Emancipation proclamation.

Not to mention most of the ships that sailed to the African Coast and Jamaica for the triangle trade, sailed out of Boston.